Air gun



Agg. z, 193s.

llllllll l G. BUGENHAGEN 2,125,600

i y AIR GUN Filed oct. e. 195e IN VEN TOR.

Patented Aug. 2, 1938 UNiTED STATES PATENT OFFICE AIR GUN George H. Bugcnhagen, Minot, N. Dak.

Application October 6, 1936, Serial No. 104,173

3 Claims.

The objects of my invention are-first, to provide a storage chamber in a compressed air gun for the `storing of compressed air and to provide a single supply sufficient for several succes- 55 sive discharges of a gun; second, to provide a discharge chamber directly connected to the storage chamber with a very small passage to permit automatic refills of the discharge chamber from the supply in the storage chamber, after the contents of the discharge chamber has been discharged; third, to provide such a storage chamber without increasing the bulkiness of the gun assembly. I attain these objects as are set forth in the following specication and as is shown in the accompanying drawing, in which:

Fig. 1 shows a side view of a typical air gun with the gun barrel super-imposed on the pumping chamber but without the usual gun stock. Fig. 2 shows a longitudinal section on a line transversely thru the muzzle end of the gun showing means for bolting the pump plunger within the pump cylinder. Fig. 3 is a longitudinal section thru the breech portion of the gun with the gun barrel removed. Fig. 4 shows a cross section on line A-A of Fig. 2; Fig. 5 shows a cross section on line B-B of Fig. 3; Fig. 6 shows the pressure spring on line C-C of Fig. 3; Fig. 7 shows an enlarged partial section of the bolt on line A--A, showing the bolt in dotted lines at position (b) in a disengaged position.

Referring to Fig. 1, I represents the pump cylinder connected to the breech blockr2, (see Fig. 3) by the tubular nipple 3, and is soldered to the tube I in the solder groove 4. In the breech block 2 is located a check valve 5 connected to a valve stem 6, held in operative position by the pyramid compression spring I. The tubular duct 3 eX- tends up thru the rear sight support 8 and connects with the gun barrel 9 as shown in Fig. 1.

The pump plunger I0 shown in Fig. 1 and Fig. 3 is slidably operative within the pump cylinder I, the pump plunger I0 is divided into a storage chamber II and a discharge chamber I4, said chambers are separated by a diaphragm wall I3,

connected by a duct I'I thru said Wall I3, the muzzle end of the chamber II has an end Wall I2, the breech end of the discharge chamber I4 is provided with a check valve I5 mounted on the valve stem I6, said valve stem I6 operative Within the tubular duct II and held in an operative posi- -tion on its valve seat by the compression spring I8. The pump seal I9 is held in place by the housing nut 2l attached to `piston head 20, said pump plunger I6 is connected and sealed to piston head 2|] by the solder filled groove 23; pump seal I9 is pressed to the pump cylinder wall by the spring 22 shown in Fig. 6 assuring a seal.

The muzzle end of the pump plunger Ill is provided with a knob 24, said knob is rotatively held in place within the end of the plunger cylinder 5 I0, between the storage chamber and wall I2 and the stop ring 25 secured to the tube I0; within the said knob 24 is a small compression spring bolt 26 held in transverse operative position by a compression spring 2'I. The said springbolt is limited 10 in its outward movement by the upset shown, the spring bolt 26 is shown in its anchored position. In Fig. 1, the slotted groove 28 at the end of the pump cylinder leads from the end of the pump cylinder I to the position of anchorage for the 15 spring bolt. Fig. 'l shows the beveled face 32 of the spring bolt 26, said face facilitates placing the bolt in an inoperative position. The spring stop catch 29 is secured to pump cylinder I by a screw 30 as shown in Fig. 1 and Fig. 2. The 20 catch extends thru an opening in the pump cylinder I, operatively it connects with the annular stop recess 3| on the piston head 20, Fig. 3. In operation, my device functions as follows: to fill the storage chamber II with compressed air the 25 knob 24 of the pump plunger is turned sufciently in the slot 28 to release the said plunger I0, then the knob 24 is turned anti-clockwise as shown in Fig. 7 to a position (b) thus preventing the spring bolt to project from the tube I0; this 30 done, the operator may proceed with the pumping of air into the chamber I I, until the desired pressure is obtained. The spring bolt 26 will pass freely into the pump cylinder and permit the piston head to be forced in tight against the 35 breech block and force practically all compressed air thru the valve I5 into the discharge chamber I4. From this chamber the air passes slowly on along the valve stem thru the tube II into the chamber I I. It Will be noted that the air pressure D in chambers II and I4 will equalize; when the air is being pumped into the chamber I4, the pressure will be greater in the discharge chamber immediately after being pumped than after equalization with the pressure in the chamber I I. How- 45 ever, when the gun is discharged, the discharge chamber is quickly emptied and the reverse action takes place. The compressed air pressure in the discharge chamber is quickly discharged by opening the check valve I5 with a suitable trigger 50 action applied to the end of the valve stem 6 of valve 5 thus opening the valve 5 first to provide a free passage for the air to be discharged from the discharge chamber I4, in the trigger operation the trigger forces the valve 5 against valve 55 l5 and thereby opens the said valve I 5.` When the compressed airhas been discharged from chamber I4, the trigger valve is released, the check valve I5 closes and the chamber i4 slowly rells with air pressure released from the storage chamber Il thru duct I1. The filling speed will of course depend on the area of free air passage provided around the valve stem I6. Before the gun can be fired, however, it will be observed that the spring bolt 26 must be placed in position shown in Fig. l for the purpose of keeping the plunger from being expelled and also to provide the proper relationship between the valves 5 and I6 in order to make the discharge mechanism operative. The chief function of valve 5 is to close the opening while the air supply is being compressed.

The spring stop 29 limits the movement of the pump plunger as it engages the piston head at the annular recess 3|, when the screw 33 is removed the spring stop 29 is also removed and the plunger may be withdrawn from the cylinder for examination or repair. It will be observed that the storage chamber may be about 12 times the size of the discharge. chamber, thus making it possible to discharge the gun a number of times from the `one air Vsupply in the storage chamber wi'thoutlosing too much pressure, thus making repeat action available in a compressed air gun.

I am aware that compressed air guns are on the market, but not to my knowledge has my device been incorporated and therefore I claim broadly as follows: 1

1,. In an air pumping mechanism for Vcompressed air guns, a pump cylinder, a tubular plunger operative within the ysaid pump cylinder, means for dividing said tubular plunger into a storage chamber and a discharge chamber, said dividing means having an equalizing duct therein, means for regulating the Speed of equalization of the air pressure in the aforesaid chambers and meansfor releasing the compressed air from the said discharge chamber to re a suitably connected compressed air gun.

2. In an air pumping mechanism for compressed air guns, a pump cylinder, a tubular plunger operative within the said pump cylinder, a storage chamber within the said plunger, means admitting compressed air into the said storage chamber, means for anchoring the said plunger in a xed inserted position, means for releasing yportions of the stored compressed air from the aforesaid tubular storage chamber, and means for controlling the volume of air discharged in each consecutive discharge.

3. In an air pumping mechanism for compressed air guns having a pump cylinder, a tubular plunger operative within the said pump cylinder, said tubular plunger having a storage chamber therein, means for sealing said plunger to theA inner walls of the aforesaid pump cylinder, means within the plunger for admitting and retaining air in the storage chamber, means for anchoring the said plunger securely within the pump cylinder, means for releasing the compressed air from the said storage chamber to iire a suitably connected air gun.

. GEORGE H. BUGENHAGEN. 

